- Brown the ground beef in a large skillet over medium-high heat, breaking it apart as it cooks.
- Add the chopped onion and minced garlic and cook until softened and fragrant.
- Stir in the broccoli, carrots, bell pepper, and snap peas, cooking until the vegetables begin to soften.
- Pour in the soy sauce, oyster sauce, hoisin sauce, sesame oil, ginger, and chili flakes, stirring to coat everything evenly.
- Let the stir fry simmer for a few minutes until the sauce thickens slightly and the vegetables reach your preferred tenderness.
- Remove from heat and serve over cooked rice or noodles.
- Garnish with sesame seeds and green onions before serving.